A pile hole wall protection device

Abstract

The utility model provides a kind of pile hole wall protection device, including bearing seat, multiple arc-shaped fender and jacking piece, bearing seat has bearing bottom plate and lower rod;Multiple arc-shaped fender is located on bearing bottom plate, and is set around lower rod, multiple arc-shaped fender head-to-tail sequentially links to enclose into circular structure, and the outer peripheral wall of each arc-shaped fender is equipped with inlaying part;Jacking piece is located in the inner periphery of circular structure and is connected with lower rod, and jacking piece is used to outward jacking arc-shaped fender, until arc-shaped fender is attached to the hole wall of pile hole.The utility model provides a kind of pile hole wall protection device, and arc-shaped fender is lowered into pile hole by the lower rod of bearing seat, without worker entering pile hole, avoid the personal safety accident caused by hole wall collapse from the root;The radial push of jacking piece realizes the inlaying fixation of arc-shaped fender, without maintenance and waiting, realize the continuous operation of with hole, with wall protection, with construction, significantly improve construction efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of building foundation construction technology, and specifically relates to a pile hole retaining device. Background Technology

[0002] When constructing pile foundations, traditional large-scale pile-forming equipment is often unsuitable for complex conditions such as narrow construction sites and limited height for pile-forming operations. Small-scale pile-forming equipment has become the primary choice for pile foundation drilling. Currently, the drilling methods for small-scale pile-forming equipment mainly include manual excavation, motorized Luoyang shovel drilling, and spiral sand cylinder drilling. However, when these drilling operations involve sandy soil layers, the loose structure and low shear strength of the sand layer make the pile hole walls prone to instability and collapse. Therefore, it is essential to perform wall protection treatment on the pile holes. In existing technologies, the protection of pile holes in sandy soil strata is mostly achieved using a manual cast-in-place reinforced concrete protection process. This process requires workers to complete the formwork erection, concrete pouring, and curing inside the pile hole. However, in actual construction, if a pile hole collapses, it can cause personal injury or death, posing a serious safety hazard. In addition, after the cast-in-place concrete protection is completed, it needs to undergo concrete curing until the concrete strength reaches the design requirements before the next pile hole construction can proceed, which significantly prolongs the construction cycle and reduces construction efficiency. Utility Model Content

[0003] This utility model provides a pile hole retaining wall device, which aims to solve the technical problems in the prior art where manual entry into the pile hole to cast reinforced concrete retaining wall is prone to personnel injury accidents, and also prolongs the construction period and reduces construction efficiency.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a pile hole wall protection device, comprising: The support base has a support base plate and a lowering rod, wherein the lowering rod is connected to the support base plate; Multiple arc-shaped protective plates are located on the bearing base plate and arranged around the lowering rod. The multiple arc-shaped protective plates are connected end-to-end to form a circular structure. The outer diameter of the circular structure is smaller than the diameter of the pile hole. Each arc-shaped protective plate has an embedding part on its outer peripheral wall. A top support member is provided on the inner circumference of the circular structure and connected to the lowering rod. The top support member has the freedom to extend and retract radially along the circular structure and is used to push the arc-shaped protective plate outward until the arc-shaped protective plate fits against the wall of the pile hole.

[0005] In one possible implementation, the top support includes: An airbag ring, fitted around the outer periphery of the lowering rod, has a hollow air cavity; A trachea, communicating with the air cavity and extending upward; and A limiting plate is connected to the outer periphery of the lowering rod and is located above the circular structure to limit the displacement of the airbag ring in the vertical direction. The air tube is used to inflate the air cavity, so that the airbag ring expands radially under the restriction of the limiting plate and pushes the arc-shaped protective plate outward.

[0006] In some embodiments, the upper surface of the limiting plate is provided with a limiting sleeve, which is threadedly connected to the lowering rod.

[0007] In one possible implementation, the two sides of the arc-shaped guard plate are respectively provided with a first connecting portion and a second connecting portion, and a connecting member is provided between two adjacent arc-shaped guard plates, the connecting member comprising: A guide rod, connected to the first connecting portion, and extending tangentially along the arc-shaped guard plate; and A guide sleeve is connected to the second connecting part and is slidably sleeved on the outer periphery of the guide rod.

[0008] In some embodiments, a backstop structure is provided between the guide rod and the guide sleeve. The backstop structure is used to prevent the arc-shaped guard plates from retracting and moving closer to each other after two adjacent arc-shaped guard plates are spread apart and move away from each other.

[0009] In some embodiments, the anti-reverse structure includes a plurality of anti-reverse teeth disposed on the outer peripheral wall of the guide rod and an elastic baffle disposed on the guide sleeve. The plurality of anti-reverse teeth are spaced apart along the axial direction of the guide rod, the anti-reverse teeth are inclined toward the side away from the first connecting portion, and the elastic baffle is used to engage with the anti-reverse teeth.

[0010] In some embodiments, the elastic baffle has an interconnected mounting portion and a snap-fit ​​portion, the outer periphery of the guide sleeve is fitted with a mounting sleeve, the mounting portion is sandwiched between the guide sleeve and the mounting sleeve, the snap-fit ​​portion extends to the inner periphery of the guide sleeve and is inclined toward the first connecting portion, and the snap-fit ​​portion is used to abut against the tooth surface of the anti-reverse tooth.

[0011] In some embodiments, the first connecting portion is provided with a reinforcing sleeve, the guide rod is threadedly connected to the reinforcing sleeve, and the end of the guide rod away from the reinforcing sleeve is provided with a screwing boss.

[0012] In one possible implementation, an extension plate is connected to the first connecting portion, and a clearance channel is provided between the second connecting portion and the arc-shaped guard plate. The clearance channel allows the extension plate on the adjacent first connecting portion to pass through, and the extension plate is used to fill the gap between two adjacent arc-shaped guard plates when the arc-shaped guard plate is in an open state.

[0013] In one possible implementation, the upper edge and lower edge of the arc-shaped guard plate are respectively connected to reinforcing plates extending outward, and the reinforcing plates form the mounting portion.

[0014] The beneficial effects of the pile hole wall protection device provided by this utility model are as follows: Compared with the prior art, the pile hole wall protection device of this utility model lowers the arc-shaped protective plate into the pile hole through the lowering rod of the bearing seat, eliminating the need for workers to enter the pile hole and fundamentally avoiding personal safety accidents caused by hole wall collapse; the arc-shaped protective plate is inserted and fixed by the radial pushing of the top support, eliminating the need for curing and waiting, and subsequent construction can be carried out immediately, realizing continuous operation of hole formation, wall protection and construction, which significantly improves construction efficiency. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of a pile hole retaining device provided in an embodiment of this utility model; Figure 2 A top sectional view of a pile hole retaining wall device provided in an embodiment of this utility model; Figure 3 This is a schematic diagram of the main sectional view of a pile hole retaining device provided in an embodiment of the present utility model; Figure 4 A schematic diagram of the structure of the arc-shaped guard plate (including a first connecting part, a second connecting part, and a reinforcing plate) provided in the embodiment of this utility model; Figure 5 A schematic diagram of the structure of multiple arc-shaped guard plates in an open state provided in an embodiment of this utility model; Figure 6 This is an embodiment of the present utility model. Figure 5 A cross-sectional view of the connector in section A without being unfolded; Figure 7 This is an embodiment of the present utility model. Figure 5 A cross-sectional view of the connector in section A with its extended position.

[0017] The following are the labeling elements in the figure: 1. Bearing seat; 11. Bearing base plate; 12. Lowering rod; 2. Arc-shaped guard plate; 21. Embedding part; 22. First connecting part; 221. Reinforcing sleeve; 222. Extension plate; 23. Second connecting part; 231. Clearance channel; 24. Reinforcing plate; 3. Top support; 31. Airbag ring; 311. Air chamber; 32. Air pipe; 33. Limiting plate; 331. Limiting sleeve; 4. Connecting part; 41. Guide rod; 411. Anti-reverse tooth; 412. Twisting boss; 42. Guide sleeve; 43. Elastic baffle; 431. Mounting part; 432. Snap-fit ​​part; 44. Mounting sleeve. Detailed Implementation

[0018] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0019] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or indirectly on the other element. It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" or "several" means two or more, unless otherwise explicitly specified.

[0020] Please refer to the following: Figures 1 to 7 The present invention provides a pile hole retaining device. The pile hole retaining device includes a bearing seat 1, multiple arc-shaped retaining plates 2, and a top support 3. The bearing seat 1 has a bearing base plate 11 and a lowering rod 12, the lowering rod 12 being connected to the bearing base plate 11. Multiple arc-shaped retaining plates 2 are located on the bearing base plate 11 and arranged around the lowering rod 12. The multiple arc-shaped retaining plates 2 are sequentially connected end-to-end to form a circular structure. The outer diameter of the circular structure is smaller than the diameter of the pile hole. Each arc-shaped retaining plate 2 has an inlay portion 21 on its outer peripheral wall. The top support 3 is located on the inner periphery of the circular structure and connected to the lowering rod 12. The top support 3 has the freedom to extend and retract radially along the circular structure, used to push the arc-shaped retaining plates 2 outwards until the arc-shaped retaining plates 2 are fitted against the hole wall of the pile hole.

[0021] This embodiment provides a pile hole wall protection device, in which multiple arc-shaped protective plates 2 are assembled into a circular structure and placed on the bearing base plate 11 of the bearing seat 1. The top support 3 is placed inside the circular structure and connected to the lowering rod 12. The lowering rod 12 is used to lower the circular structure and the top support 3 into the pile hole. Then, the top support 3 is operated to extend it radially outward along the circular structure to push each arc-shaped protective plate 2 toward the hole wall until each arc-shaped protective plate 2 is attached to the pile hole wall. At the same time, the embedding part 21 on the outer peripheral wall of the arc-shaped protective plate 2 is embedded in the sand layer of the pile hole wall to form a mechanical anchor and achieve stable wall protection.

[0022] Compared with the prior art, the pile hole wall protection device provided in this embodiment lowers the arc-shaped protective plate 2 into the pile hole through the lowering rod 12 of the bearing seat 1, eliminating the need for workers to enter the pile hole and fundamentally avoiding personal safety accidents caused by hole wall collapse; the arc-shaped protective plate 2 is inserted and fixed by the radial pushing of the top support 3, eliminating the need for curing and waiting, and subsequent construction can be carried out immediately, realizing continuous operation of hole formation, wall protection and construction, which significantly improves construction efficiency.

[0023] The more arc-shaped protective plates 2 are set, the better the fit with the pile hole wall after being spread out. However, the assembly process is also relatively complicated. In this embodiment, three arc-shaped protective plates 2 are used, which can not only ensure the fit with the protective wall, but also take into account the convenience of assembly.

[0024] In the actual construction process, firstly, small pile-forming equipment is used to drill holes at the pre-set pile hole locations. The depth of each hole is no more than 0.5m to ensure that the hole wall can stand upright and not collapse after drilling in the sandy soil layer. Near the ground hole opening, multiple arc-shaped protective plates 2 are assembled into a circular structure. The outer diameter of the circular structure must be smaller than the diameter of the pile hole to facilitate its smooth lowering into the pile hole. The circular structure is placed on the bearing base plate 11, and the top support 3 is placed inside the circular structure and connected to the lowering rod 12.

[0025] Afterwards, the lowering rod 12 can be connected to the wire rope of the winch, and the entire device can be lowered to the bottom of the pile hole using the winch. Operate the top support 3 to extend radially outward and push each arc-shaped protective plate 2, so that the circular structure is stretched open and fits against the pile hole wall, thus achieving pile hole wall protection within this depth range.

[0026] Operate the top support 3 again, causing it to retract radially until it separates from the arc-shaped protective plate 2. It is important to note that when the arc-shaped protective plate 2 is pushed open to fit against the pile hole wall, it also separates from the bearing base plate 11. That is, the bearing base plate 11 no longer supports the arc-shaped protective plates 2, but is located inside each arc-shaped protective plate 2. At this point, the entire support seat is completely detached from the arc-shaped protective plates 2. The winch can then be used to pull up and down the lowering rod 12 again to lift the support seat out of the pile hole, completing the single-step wall protection. Repeat the above steps, performing single-step drilling and wall protection operations sequentially, ultimately completing the pile hole formation and wall protection construction in the sandy soil layer simultaneously.

[0027] In the above process, each arc-shaped protective plate 2 is pre-assembled into a circular structure, which facilitates the top support 3 to apply a uniform jacking force to each arc-shaped protective plate 2, ensuring the fit between each arc-shaped protective plate 2 and the borehole wall. After the arc-shaped protective plate 2 fits against the borehole wall, it can evenly disperse the lateral pressure of the sand layer. At the same time, the embedding part 21 is embedded into the sand layer of the borehole wall, forming a reinforcement effect similar to anchoring, which enhances the stability of the protective wall device and reduces the probability of borehole wall collapse when the borehole is drilled again.

[0028] Moreover, the aforementioned wall protection method is a dry construction process, eliminating the need for cast-in-place concrete and formwork, thus reducing building material consumption and waste emissions, meeting the requirements of green construction, and making construction operations more convenient. In addition, the device is composed of modular components such as the bearing seat 1, the arc-shaped protective plate 2, and the top support 3. It is small in size and lightweight, can be assembled and used on-site, and can complete various operations with small equipment. It is suitable for working conditions with narrow spaces and height restrictions, solving the problem of large wall protection equipment being unable to enter the site.

[0029] Specifically, the top support 3 can adopt a hydraulic push rod structure, with the cylinder of the hydraulic push rod fixedly connected to the outer periphery of the lowering rod 12. The piston rod end of the hydraulic push rod is connected to an arc-shaped push plate (adapted to the inner peripheral wall of the arc-shaped guard plate 2). The number of hydraulic push rods corresponds one-to-one with the number of arc-shaped guard plates 2. By controlling the extension of the piston rod of the hydraulic push rod, each arc-shaped guard plate 2 is pushed outward. The top support 3 can also adopt an airbag structure, using an air compressor to inflate the inner cavity of the airbag. By constraining the expansion direction of the airbag, it can only expand radially, thereby generating a pushing force on the arc-shaped guard plate 2.

[0030] In some embodiments, the top support 3 may be adopted as follows: Figure 1 , Figure 2 and Figure 3 The structure shown. See also Figure 1 , Figure 2 and Figure 3The top support 3 includes an airbag ring 31, an air tube 32, and a limiting plate 33. The airbag ring 31 is sleeved on the outer periphery of the lowering rod 12 and has a hollow air cavity 311. The air tube 32 is connected to the air cavity 311 and extends upward. The limiting plate 33 is connected to the outer periphery of the lowering rod 12 and is located above the circular structure to limit the displacement of the airbag ring 31 in the vertical direction. The air tube 32 is used to inflate the air cavity 311 so that the airbag ring 31 expands radially under the restriction of the limiting plate 33 and pushes the arc-shaped guard plate 2 outward.

[0031] In this embodiment, the air tube 32 extends upward along the lowering rod 12, facilitating connection between the air tube 32 and an air compressor on the ground, allowing air to be supplied to the air chamber 311 within the airbag ring 31 via the air tube 32. Specifically, a clearance hole can be provided on the limiting plate 33. After the air tube 32 is connected to the side wall of the airbag ring 31, it extends upward through the clearance hole. The air tube 32 can be wrapped around the outer circumference of the lowering rod 12, or tied to the outer circumference of the lowering rod 12 using straps, to avoid the air tube 32 scattering and tangling during lowering or raising. Alternatively, the lowering rod 12 can be configured as a hollow rod structure, with the air tube 32 connected to the inner circumferential wall of the airbag ring 31 and extending upward along the hollow inner cavity of the lowering rod 12. This avoids interference between the air tube 32 and other components, ensuring a stable supply of compressed air via the air tube 32.

[0032] Inflation is achieved through the air pipe 32 into the air chamber 311 of the airbag ring 31, which is fitted around the lowering rod 12. The airbag ring 31, constrained by the limiting plate 33 located above the circular structure, cannot expand upwards and thus only expands radially, pushing the arc-shaped protective plate 2 outwards to conform to the borehole wall and embedding the fitting part 21 into the sand layer of the borehole wall. Afterwards, by opening the vent valve on the air pipe 32, the air chamber 311 is deflated, and the volume of the airbag ring 31 gradually shrinks, allowing it to be lifted out of the pile hole along with the bearing seat 1.

[0033] Because the airbag ring 31 is a flexible structure, it can form a surface contact with the inner circumference of the arc-shaped protective plate 2 when inflated, so that the jacking force is evenly distributed along the circumference of the protective plate, avoiding local pressure concentration and thus reducing the risk of collapse of the sand layer pore wall due to uneven stress. The setting of the limiting plate 33 strictly limits the expansion direction of the airbag ring 31 to radial, ensuring that all the inflation energy is converted into an effective jacking force on the arc-shaped protective plate 2, improving energy utilization efficiency. At the same time, the jacking of the arc-shaped protective plate 2 is achieved by inflating the airbag ring 31, which has low construction cost and meets the requirements of green construction and low-carbon environmental protection.

[0034] For example, the upper surface of the limiting plate 33 is provided with a limiting sleeve 331, which is threadedly connected to the lowering rod 12.

[0035] The limiting sleeve 331 is threadedly connected to the lowering rod 12. The height of the limiting plate 33 can be flexibly adjusted by rotating the limiting sleeve 331, thereby adapting to airbag rings 31 or arc-shaped guard plates 2 of different sizes. At the same time, the threaded connection has self-locking properties, and the position of the limiting plate 33 is stable after adjustment, making it difficult to shift and ensuring the restraint effect on the airbag ring 31.

[0036] Furthermore, the limiting sleeve 331 can be separately installed from the limiting plate 33. The limiting sleeve 331 adopts the form of a standard hexagonal nut. After the limiting plate 33 is fitted onto the lowering rod 12, the hexagonal nut is screwed onto the lowering rod 12 and abuts against the upper surface of the limiting plate 33, thereby constraining the expansion direction of the airbag ring 31 through the limiting plate 33. The above-mentioned separate installation and the selection of a standard hexagonal nut further simplify the processing procedures and help reduce processing costs.

[0037] Based on the above embodiments, see Figure 1 , Figure 5 , Figure 6 and Figure 7 The two sides of the arc-shaped guard plate 2 are respectively provided with a first connecting part 22 and a second connecting part 23. A connecting member 4 is provided between two adjacent arc-shaped guard plates 2. The connecting member 4 includes a guide rod 41 and a guide sleeve 42. The guide rod 41 is connected to the first connecting part 22 and extends tangentially along the arc-shaped guard plate 2. The guide sleeve 42 is connected to the second connecting part 23 and is slidably sleeved on the outer periphery of the guide rod 41.

[0038] Adjacent arc-shaped protective plates 2 are connected by connectors 4. On the one hand, this allows for pre-positioning of adjacent arc-shaped protective plates 2 during the assembly of the circular structure, eliminating the need for complex fastening operations and meeting the requirements of rapid assembly. On the other hand, the sliding engagement between the guide rod 41 and the guide sleeve 42 of the connector 4 constrains the relative movement direction of adjacent arc-shaped protective plates 2, preventing misalignment between the arc-shaped protective plates 2 during the jacking process and ensuring the effectiveness of the protective wall. In addition, when the jacking component 3 pushes the arc-shaped protective plate 2 to move radially, the guide rod 41 extends and retracts synchronously within the guide sleeve 42, which can adapt to changes in the spacing between adjacent arc-shaped protective plates 2, ensuring that the connection remains effective. When the arc-shaped protective plates 2 are attached to the pile hole wall, multiple arc-shaped protective plates 2 can still be connected as one, increasing the stability of the protective wall effect.

[0039] Specifically, the first connecting part 22 and the second connecting part 23 can be angle steel structures welded to the side edges of the arc-shaped guard plate 2, respectively. The connector 4 is set through one rib of the angle steel, and the other rib of the angle steel is welded to the arc-shaped guard plate 2, which can also increase the rigidity of the arc-shaped guard plate 2. Four connectors 4 are provided at intervals along the height direction between each group of adjacent arc-shaped guard plates 2 to ensure the stability of the connection.

[0040] In some possible implementations, a backstop structure is provided between the guide rod 41 and the guide sleeve 42. The backstop structure is used to restrict the arc-shaped guard plates 2 from retracting and moving closer to each other after the two adjacent arc-shaped guard plates 2 are spread apart and move away from each other.

[0041] By restricting the retraction of the arc-shaped protective plate 2 through the anti-retraction structure, the arc-shaped protective plate 2 can always be kept in an open state, ensuring reliable support for the pile hole wall and preventing the arc-shaped protective plate 2 from retracting and the embedded part 21 from dislodging from the hole wall due to the lateral pressure of the sand layer, thereby maintaining the stability of the protective wall state.

[0042] The anti-reverse structure can adopt a ratchet and pawl structure. For example, continuous ratchet teeth are provided along the length direction on the outer peripheral wall of the guide rod 41, and a pawl that can rotate around a pin is provided at a corresponding position inside the guide sleeve 42. A return spring is connected between the pawl and the inner wall of the guide sleeve 42. The pawl can only be lifted under the guidance of the ratchet inclined surface, so that the first connecting part 22 and the second connecting part 23 can move away from each other when the arc-shaped guard plate 2 moves outward; when the arc-shaped guard plate 2 attempts to retract, the pawl will engage with the ratchet groove, and the guide rod 41 is restricted to move in the opposite direction through mechanical engagement, thereby achieving anti-reverse movement.

[0043] Optionally, the anti-reverse structure can also adopt an elastic locking pin and positioning hole structure. For example, multiple positioning holes are provided at intervals along the length direction on the inner peripheral wall of the guide sleeve 42, and an elastic locking pin with a return spring is assembled on the outer peripheral wall of the guide rod 41. The outer end of the elastic locking pin is hemispherical, and the guide rod 41 can only move to one side of the spherical surface, and the guide rod 41 is not allowed to move in the opposite direction.

[0044] For details, see Figure 6 and Figure 7 The anti-reverse structure includes a plurality of anti-reverse teeth 411 provided on the outer peripheral wall of the guide rod 41 and an elastic baffle 43 provided on the guide sleeve 42. The plurality of anti-reverse teeth 411 are spaced apart along the axial direction of the guide rod 41. The anti-reverse teeth 411 are inclined toward the side away from the first connecting part 22. The elastic baffle 43 is used to engage with the anti-reverse teeth 411.

[0045] When the arc-shaped guard plate 2 is opened by the top support force, the first connecting part 22 and the second connecting part 23 on the two adjacent arc-shaped guard plates 2 move radially outward and move away from each other. The guide rod 41 slides along the axial direction of the guide sleeve 42. Under the guidance of the inclined surface of the anti-reverse tooth 411, the elastic baffle 43 deforms and moves closer to the inner peripheral wall of the guide sleeve 42 to allow the guide rod 41 to pass through. When the first connecting part 22 and the second connecting part 23 are separated to a preset distance, the elastic baffle 43 can automatically reset by its own elasticity and engage with the tooth surface of the anti-reverse tooth 411 (the surface perpendicular to the axial direction of the guide rod 41) to form an irreversible mechanical lock, preventing the guide rod 41 from sliding in the opposite direction, thereby limiting the retraction of the arc-shaped guard plate 2 and ensuring that the insert part 21 is always inserted into the hole wall, maintaining the effective support of the wall protection device for the sand layer.

[0046] Multiple anti-reverse teeth 411 are spaced apart along the axial direction of the guide rod 41 to accommodate different opening amplitudes. This allows the device to flexibly adjust and lock the position of the protective plate according to the actual diameter of the pile hole, enhancing its adaptability to pile holes in complex sandy layers. The elastic baffle 43 achieves automatic locking and resetting based on its own elasticity, eliminating the need for additional operating parts, simplifying the structural design, reducing the risk of failure, and enabling rapid guiding, opening, and locking of the arc-shaped protective plate 2 in confined spaces, thus improving construction efficiency.

[0047] For example, the elastic baffle 43 has an installation portion 431 and a snap-fit ​​portion 432 connected to each other. The guide sleeve 42 is fitted with an installation sleeve 44 on its outer periphery. The installation portion 431 is sandwiched between the guide sleeve 42 and the installation sleeve 44. The snap-fit ​​portion 432 extends to the inner periphery of the guide sleeve 42 and is inclined toward the first connecting portion 22. The snap-fit ​​portion 432 is used to abut against the tooth surface of the anti-reverse tooth 411.

[0048] In this embodiment, the elastic baffle 43 is made of bent thin steel sheet, which gives it both elasticity and rigidity when in contact. Multiple elastic baffles 43 can be arranged at intervals along the circumference of the guide sleeve 42 to increase the stability of the anti-reverse action.

[0049] A mounting sleeve 44 is fitted around the outer periphery of the guide sleeve 42, so that the mounting portion 431 of the elastic baffle 43 is sandwiched between the guide sleeve 42 and the mounting sleeve 44. The outer end of the mounting sleeve 44 has a stop portion extending towards the axis to limit the axial movement of the elastic baffle 43. By connecting the mounting sleeve 44 and the guide sleeve 42, the elastic baffle 43 can be reliably installed, preventing displacement or detachment of the elastic baffle 43 during repeated stress, and ensuring the long-term reliability of the anti-reverse structure. Specifically, the mounting sleeve 44 and the guide sleeve 42 can be directly fixed by welding, or they can be detachably connected by fasteners such as screws; no limitation is made here.

[0050] The snap-fit ​​portion 432 with a radial plane is formed by bending a thin steel plate, which increases the snap-fit ​​area between the elastic baffle 43 and the tooth surface of the anti-slip tooth 411, avoids slippage, and enhances the anti-slip effect.

[0051] For example, the first connecting part 22 is provided with a reinforcing sleeve 221, the guide rod 41 is threadedly connected to the reinforcing sleeve 221, and the end of the guide rod 41 away from the reinforcing sleeve 221 is provided with a screwing boss 412.

[0052] In this embodiment, the guide sleeve 42 can be directly fixed to the second connecting part 23 by welding to reduce assembly steps; however, due to the anti-reverse structure, when assembling multiple arc-shaped guard plates 2, the guide rod 41 must be inserted from the side of the guide sleeve 42 away from the first connecting part 22 before being connected to the first connecting part 22. The guide rod 41 is threadedly connected to the reinforcing sleeve 221, and a screw-on boss 412 is provided on the guide rod 41. By holding and rotating the screw-on boss 412, the guide rod 41 can be easily installed. The assembly process is simple and easy to operate.

[0053] By adding a reinforcing sleeve 221 to the side wall of the first connecting part 22 and using the reinforcing sleeve 221 to be threadedly connected to the guide rod 41, the area of ​​the threaded connection can be increased without increasing the thickness of the first connecting part 22, thus ensuring the stability of the connection.

[0054] In some embodiments, see Figure 4 and Figure 5 An extension plate 222 is connected to the first connecting part 22, and a clearance channel 231 is provided between the second connecting part 23 and the arc-shaped guard plate 2. The clearance channel 231 allows the extension plate 222 on the adjacent first connecting part 22 to pass through. The extension plate 222 is used to fill the gap between two adjacent arc-shaped guard plates 2 when the arc-shaped guard plate 2 is in the open state.

[0055] The clearance passage 231 provides a through space for the extension plate 222, ensuring that during the expansion of the arc-shaped protective plate 2, when adjacent arc-shaped protective plates 2 experience relative displacement due to radial expansion, the extension plate 222 can move synchronously with the first connecting part 22 without being jammed, thus ensuring the smoothness of the expansion action of the arc-shaped protective plate 2. Simultaneously, when the arc-shaped protective plate 2 is in the expanded state, the extension plate 222 can precisely fill the gap between adjacent arc-shaped protective plates 2, effectively preventing sand from leaking into the pile hole through the gap, avoiding instability and collapse of the hole wall due to sand leakage, and enhancing the effectiveness of the protective wall.

[0056] The above structure can fill the gap without additional sealing components, simplifying the device design. Furthermore, the extension plate 222 moves synchronously with the arc-shaped guard plate 2, adapting to gap changes under different opening amplitudes, thus enhancing the device's adaptability to pile holes of different diameters.

[0057] Specifically, the extension plate 222 can be an integral structure with the first connecting part 22, made of unequal-sided angle steel, simplifying the processing steps. Alternatively, an extension plate 222 with a certain curvature can be welded to the first connecting part 22 to better adapt the extension plate 222 to the avoidance channel 231, thereby improving the smoothness of the jacking process.

[0058] See some possible embodiments. Figure 1 and Figure 4The upper edge and lower edge of the arc-shaped guard plate 2 are respectively connected to a reinforcing plate 24 extending outward, and the reinforcing plate 24 forms an insert portion 21.

[0059] The reinforcement plate 24 effectively enhances the overall rigidity of the upper and lower edges of the arc-shaped guard plate 2, preventing the arc-shaped guard plate 2 from warping or deforming due to its weak edges when subjected to lateral pressure from the sand layer, thus improving the arc-shaped guard plate 2's resistance to deformation. On the other hand, it can be directly used as the mounting part 21 of the arc-shaped guard plate 2. The outwardly extending reinforcement plate 24 can significantly increase the contact area with the hole wall, making the mounting more stable and preventing the arc-shaped guard plate 2 from retracting and detaching from the hole wall, thus ensuring the reliability of the guard wall.

[0060] Specifically, the reinforcing plate 24 can also be made of angle steel. One rib of the angle steel is welded to the arc-shaped guard plate 2, and the other rib extends outward as a reinforcing plate 24, further increasing the rigidity of the arc-shaped guard plate 2. In addition, one or more auxiliary reinforcing plates can be further provided on the outer peripheral wall of the arc-shaped guard plate 2. The reinforcing plates are located between the first connecting part 22 and the second connecting part 23. The two ends of the reinforcing plates can be welded to the two reinforcing plates 24 respectively. The reinforcing plates also adopt the structure of angle steel. One rib of the angle steel extends outward and can also serve as the insert part 21, further increasing the rigidity of the arc-shaped guard plate 2 and the insertion stability of the insert part 21.

[0061] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pile hole retaining wall device, characterized in that, include: The support base has a support base plate and a lowering rod, wherein the lowering rod is connected to the support base plate; Multiple arc-shaped protective plates are located on the bearing base plate and arranged around the lowering rod. The multiple arc-shaped protective plates are connected end-to-end to form a circular structure. The outer diameter of the circular structure is smaller than the diameter of the pile hole. Each arc-shaped protective plate has an embedding part on its outer peripheral wall. A top support member is provided on the inner circumference of the circular structure and connected to the lowering rod. The top support member has the freedom to extend and retract radially along the circular structure and is used to push the arc-shaped protective plate outward until the arc-shaped protective plate fits against the wall of the pile hole.

2. The pile hole wall protection device as described in claim 1, characterized in that, The top support includes: An airbag ring, fitted around the outer periphery of the lowering rod, has a hollow air cavity; A trachea, communicating with the air cavity and extending upward; and A limiting plate is connected to the outer periphery of the lowering rod and is located above the circular structure to limit the displacement of the airbag ring in the vertical direction. The air tube is used to inflate the air cavity, so that the airbag ring expands radially under the restriction of the limiting plate and pushes the arc-shaped protective plate outward.

3. A pile hole retaining wall device as described in claim 2, characterized in that, The upper surface of the limiting plate is provided with a limiting sleeve, which is threadedly connected to the lowering rod.

4. A pile hole retaining wall device as described in claim 1, characterized in that, The two sides of the arc-shaped guard plate are respectively provided with a first connecting part and a second connecting part, and a connecting member is provided between two adjacent arc-shaped guard plates. The connecting member includes: A guide rod, connected to the first connecting portion, and extending tangentially along the arc-shaped guard plate; and A guide sleeve is connected to the second connecting part and is slidably sleeved on the outer periphery of the guide rod.

5. A pile hole retaining wall device as described in claim 4, characterized in that, An anti-retraction structure is provided between the guide rod and the guide sleeve. The anti-retraction structure is used to prevent the arc-shaped guard plates from retracting and moving closer to each other after the two adjacent arc-shaped guard plates are spread apart and move away from each other.

6. A pile hole retaining wall device as described in claim 5, characterized in that, The anti-reverse structure includes a plurality of anti-reverse teeth provided on the outer peripheral wall of the guide rod and an elastic baffle provided on the guide sleeve. The plurality of anti-reverse teeth are spaced apart along the axial direction of the guide rod, and the anti-reverse teeth are inclined toward the side away from the first connecting part. The elastic baffle is used to engage with the anti-reverse teeth.

7. A pile hole retaining wall device as described in claim 6, characterized in that, The elastic baffle has an interconnected mounting portion and a snap-fit ​​portion. The guide sleeve is fitted with a mounting sleeve on its outer periphery. The mounting portion is sandwiched between the guide sleeve and the mounting sleeve. The snap-fit ​​portion extends to the inner periphery of the guide sleeve and is inclined toward the first connecting portion. The snap-fit ​​portion is used to abut against the tooth surface of the anti-reverse tooth.

8. A pile hole retaining wall device as described in claim 6, characterized in that, The first connecting part is provided with a reinforcing sleeve, the guide rod is threadedly connected to the reinforcing sleeve, and the end of the guide rod away from the reinforcing sleeve is provided with a screwing boss.

9. A pile hole retaining wall device as described in claim 4, characterized in that, An extension plate is connected to the first connecting part, and a clearance channel is provided between the second connecting part and the arc-shaped guard plate. The clearance channel allows the extension plate on the adjacent first connecting part to pass through. The extension plate is used to fill the gap between two adjacent arc-shaped guard plates when the arc-shaped guard plate is in the open state.

10. A pile hole retaining wall device as described in claim 1, characterized in that, The upper edge and lower edge of the arc-shaped guard plate are respectively connected to reinforcing plates extending outward, and the reinforcing plates form the mounting portion.

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